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首页> 外文期刊>Journal of Hazardous Materials >Source-specific ecological risk analysis and critical source identification of heavy metals in road dust in Beijing, China
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Source-specific ecological risk analysis and critical source identification of heavy metals in road dust in Beijing, China

机译：北京市道路扬尘中特定源生态风险分析和关键源识别

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摘要

To explore the spatial variation of source-specific ecological risks and identify critical sources of heavy metals in road dust, 36 road dust samples collected in Beijing in March 2017 were analyzed for heavy metals. A new method that takes into consideration the heavy-metal toxic response and is flexible to changes in the number of calculated heavy metals, called the Nemerow integrated risk index (NIRI), was developed for ecological risk assessment. The NIRI indicated that heavy metals posed considerable to high risks at the majority of sites, and 22 % of the sites suffered extreme risk in spring (NIRI > 320). Four main sources were identified based on positive matrix factorization (PMF): traffic exhaust, fuel combustion, construction, and use of pesticides and fertilizers. Owing to the lower toxic response factors of representative heavy metals of fuel combustion than those of other sources, although fuel combustion had the highest contribution (34.21 %) to heavy metals in spring, it only contributed 5.57 % to ecological risks. Critical sources and critical source areas were determined by considering the contributions to both heavy metals and ecological risks. The use of pesticide and fertilizer and traffic-related exhaust were identified as critical sources of heavy metals in spring. Source-specific ecological risks and critical sources of heavy metals changed with the changing seasons, which suggests that different strategies should be adopted in different seasons.
机译：为了探索特定源生态风险的空间变化并确定道路扬尘中重金属的关键来源，分析了2017年3月在北京收集的36个道路扬尘样品中的重金属。针对生态风险评估，开发了一种新方法，该方法考虑了重金属的毒性反应，并且可以灵活地计算重金属的数量变化，该方法被称为Nemerow综合风险指数（NIRI）。 NIRI指出，大多数地点的重金属构成高风险，而22％的地点在春季遭受极端风险（NIRI> 320）。根据正矩阵分解（PMF）确定了四个主要来源：交通尾气，燃料燃烧，建筑以及农药和化肥的使用。由于燃料燃烧中代表性的重金属的毒害响应因子低于其他来源，尽管春季燃料燃烧对重金属的贡献最大（34.21％），但对生态风险的贡献仅为5.57％。通过考虑对重金属和生态风险的贡献来确定关键源和关键源区域。在春季，农药和化肥的使用以及与交通有关的废气被确定为重金属的重要来源。特定来源的生态风险和重金属的关键来源随季节的变化而变化，这表明在不同的季节应采用不同的策略。

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  • 来源
    《Journal of Hazardous Materials》 |2020年第15期|121763.1-121763.12|共12页
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  • 作者单位

    Beijing Normal Univ Sch Environm State Key Lab Water Environm Simulat 19 Xinjiekouwai St Beijing 100875 Peoples R China;

    Nanjing Agr Univ Coll Agron Nanjing 210095 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Heavy metals; Road dust; Integrated ecological risk; Source-specific risk apportionment; Critical source;

    机译：重金属;道路扬尘;综合生态风险;特定来源的风险分摊;关键来源;

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